NATO believes that there are 20,000 Russian troops massed along the border, while Ukraine says there are 45,000. According to Ukrainian military spokesman Andriy Lysenko, “about 45,000 troops of the armed forces and internal forces of the Russian Federation are concentrated in border areas.” It’s not just infantry, either. The spokesman said the infantry were supported by 160 tanks, 1,360 armoured vehicles, 390 artillery systems, up to 150 Grad missile launchers, 192 fighter aircraft, and 137 attack helicopters.

NATO thinks that there is a “high probability” that Russia will intervene militarily in eastern Ukraine.

Is this just an isolated case of Russian troops entering the Ukraine? Or does it mean that Russian troops will launch a full-scale invasion of Ukraine in the future?